Figure 1.

Age and gender distribution data from a total of 3190 children and adolescents hospitalized with acute respiratory infections in 2019–2022. (A) PCR-confirmed samples from children aged 0–17 years (B) Age and gender distribution data by the three successive research periods: the first being 2019–2020), which was the pre-pandemic season; the second was 2020–2021, and the third was 2021–2022. *** and **: Differences between groups were statistically significant (Chi-square test, p < 0.01 and p < 0.05, respectively).